add earlyaccess code generation

booking.admin.inc

@@ -627,6 +627,14 @@ function booking_admin() {
       t('Yes')
     ),
     '#default_value' => variable_get('booking_enable_earlyaccess_codes', 0)
+  );
+  $form['regn_options']['booking_earlyaccess_codes_count'] = array(
+    '#type' => 'textfield',
+    '#title' => t('Number of early access codes'),
+    '#description' => t("Set to the number of early access codes to generate. You will need to visit the configuration page to actually generate these codes."),
+    '#size' => 3,
+    '#maxlength' => 3,
+    '#default_value' => variable_get('booking_earlyaccess_codes_count', '0'),
   );  
   
   $form['management'] = array(

booking.earlyaccess_admin.inc

@@ -38,4 +38,59 @@ function booking_earlyaccess_admin() {
 	$output .= theme('table', array('header' => $header, 'rows' => $rows, 'attributes' => $attributes));
 
 	return $output;
+}
+
+/**
+ * Function to generate early access codes for the current event
+ */
+function booking_earlyaccess_generate_codes() {
+  global $event;
+  $num_codes_to_add = 0;
+  $num_codes_available = 0;
+  $code_length = 6;
+
+  //determine number of currently available access codes for this event
+	$codecount_query = db_query("SELECT count(*) as num_codes FROM {booking_regn_earlyaccess_codes} where booking_eventid = :eventid and booking_regn_earlyaccess_code_avail = 'Y'",
+	  array(':eventid' => $event->eid))
+		->fetchObject();
+  $num_codes_available = $codecount_query->num_codes;
+  //get the number of codes we need to have available from variable_get('booking_earlyaccess_codes_count')
+  $num_codes_to_add = variable_get('booking_earlyaccess_codes_count', 0) - $num_codes_available;
+  //add required number of codes to database table
+
+	//use the multi-insert query type at https://drupal.org/node/310079
+	$insert_query = db_insert('booking_regn_earlyaccess_codes')
+    ->fields(array(
+      'booking_eventid',
+      'booking_regn_earlyaccess_code', 
+			'booking_regn_earlyaccess_code_avail',
+  ));	
+	
+  for ($i = 0; $i < $num_codes_to_add; $i++) {
+    $insert_query->values(array(
+      'booking_eventid' => $event->eid,
+      'booking_regn_earlyaccess_code' => booking_getToken(code_length),
+      'booking_regn_earlyaccess_code_avail' => 'Y',
+    ));
+  }
+	$insert_query->execute();
+}
+
+/**
+ * Function to calculate unique code
+ * @see https://stackoverflow.com/questions/1846202/php-how-to-generate-a-random-unique-alphanumeric-string
+ * Requires PHP7
+ */
+function booking_getToken($length){
+  $token = "";
+  $codeAlphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
+  //$codeAlphabet.= "abcdefghijklmnopqrstuvwxyz";
+  $codeAlphabet.= "0123456789";
+  $max = strlen($codeAlphabet); // edited
+
+  for ($i=0; $i < $length; $i++) {
+    $token .= $codeAlphabet[random_int(0, $max-1)];
+  }
+
+  return $token;
 }

booking.misc.inc

@@ -40,11 +40,4 @@ function booking_generate_luckynumbers() {
 	drupal_set_message(t('Finished.'));
 
 	return t("<h3>Generate Lucky Numbers</h3>");	 	
-}
-
-/**
- * Function to populate the booking_regn_earlyaccess_codes table used for storing and checking early registration access codes
- */
-function booking_generate_earlyregn_codes() {
-  global $event;
 }

booking.module

@@ -714,10 +714,18 @@ function booking_menu() {
 		'title'                               => 'Booking module Early Access Codes',
 		'description'                         => 'Define and configure Early Access Codes for the Booking module',
 		'page callback'												=> 'booking_earlyaccess_admin',
-		'access arguments'										=> array('administer site configuration'),
+		'access arguments'										=> array('access administration pages'),
 		'file'																=> 'booking.earlyaccess_admin.inc',
 		'type'                                => MENU_NORMAL_ITEM,
-	);		
+	);
+	$items['admin/booking/earlyaccess/generate'] = array(
+		'title'                               => 'Generate Early Access Codes',
+		'description'                         => 'Generate Early Access Codes',
+		'page callback' 											=> 'booking_earlyaccess_generate_codes',
+		'access arguments' 										=> array('access administration pages'),
+		'file'																=> 'booking.earlyaccess_admin.inc',		
+		'type'                                => MENU_LOCAL_ACTION,	
+	);			
 
 	//the paypal IPN
 	$items[BOOKING_PAYPAL_IPN_PATH] = array(